(19)

(11)

EP 0 493 452 A1

(12)

(43) Date of publication: 08.07.1992 Bulletin 1992/28 (21) Application number: 90914042.0 (22) Date of filing: 28.09.1990

(51) International Patent Classification (IPC):  A63C 5/ 00( . ) A63C 9/ 00( . ) (86) International application number: PCT/CA1990/000322 (87) International publication number: WO 1991/004770 (18.04.1991 Gazette 1991/09)

(84) Designated Contracting States: AT CH DE FR LI SE (30) Priority: 29.09.1989 CA 19890615220 (71) Applicant: SUTHERLAND, Robert L. Calgary Alberta T2S 0J2 (CA)	(72) Inventor: SUTHERLAND, Robert L. Calgary Alberta T2S 0J2 (CA) (74) Representative: Wagner, Karl H.  WAGNER & GEYER Patentanwälte Gewürzmühlstrasse 5 D-80538 München D-80538 München (DE)